Correction: Canada-Arctic Ice story

In a Sept. 29 story about the Canadian Arctic, The Associated Press reported based on wrong information that the last remaining ice shelves in Canada along the coast of Ellesmere Island cover an estimated 402 square miles. Those measurements were for the end of the last century. The ice shelves' estimated area today is 217 square miles. Separately, the AP reported erroneously that the Serson Ice Shelf shrank to two remnant sections five years ago. It shrank to two remnant sections three years ago.